I actually have the TF heads, and the specs say it's good for .700 lift with the springs, titanium keepers, and all the important gear. I think Jim Brown is trying to take maximum advantage of the heads with his cam recommendations. Since I want the car to appear somewhat stock, I'll ask him to tone it down a bit. My Swinger 340 will be 90% street, 10% strip. I've decided to go no more than 10.5 to 1 compression, so I can use today's cat piss gas. I have the matching TF track heat intake with the 2" spacer. I plan on using my new Quick Fuel 750 DP AN carb, and a new MSD E-Curve distributor. I'm finally retired, and I want to use the parts I've collected over the past 10+ years. My thanks to all the Gurus on this site for all their advice. She'll be a bad azz street car for my retirement cruising.